third_party/llvm-7.0/llvm/test/CodeGen/Hexagon/ifcvt-impuse-livein.mir

# RUN: llc -march=hexagon -run-pass if-converter %s -o - | FileCheck %s

# Make sure that the necessary implicit uses are added to predicated
# instructions.

# CHECK-LABEL: name: foo

--- |
  define void @foo() {
    ret void
  }
...

---
name: foo
tracksRegLiveness: true
body: |
  bb.0:
    successors: %bb.1, %bb.2
    liveins: $r0, $r2, $p1
        J2_jumpf $p1, %bb.1, implicit-def $pc
        J2_jump %bb.2, implicit-def $pc
  bb.1:
    successors: %bb.3
    liveins: $r2
        $r0 = A2_tfrsi 2
        J2_jump %bb.3, implicit-def $pc
  bb.2:
    successors: %bb.3
    liveins: $r0
    ; Even though r2 was not live on entry to this block, it was live across
    ; block bb.1 in the original diamond. After if-conversion, the diamond
    ; became a single block, and so r2 is now live on entry to the instructions
    ; originating from bb.2.
    ; CHECK: $r2 = C2_cmoveit $p1, 1, implicit killed $r2
        $r2 = A2_tfrsi 1
  bb.3:
    liveins: $r0, $r2
        $r0 = A2_add $r0, $r2
        J2_jumpr $r31, implicit-def $pc
...